121111022221110 has 96 divisors (see below), whose sum is σ = 319668669421920. Its totient is φ = 31806256863744.

The previous prime is 121111022221073. The next prime is 121111022221181. The reversal of 121111022221110 is 11122220111121.

It is a happy number.

121111022221110 is a `hidden beast` number, since 1 + 211 + 1 + 10 + 222 + 211 + 10 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21536154 + ... + 26571186.

It is an arithmetic number, because the mean of its divisors is an integer number (3329881973145).

Almost surely, 2^{121111022221110} is an apocalyptic number.

121111022221110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121111022221110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159834334710960).

121111022221110 is an abundant number, since it is smaller than the sum of its proper divisors (198557647200810).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121111022221110 is a wasteful number, since it uses less digits than its factorization.

121111022221110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5039102 (or 5039099 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 121111022221110 its reverse (11122220111121), we get a palindrome (132233242332231).

The spelling of 121111022221110 in words is "one hundred twenty-one trillion, one hundred eleven billion, twenty-two million, two hundred twenty-one thousand, one hundred ten".